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anv: fix viewport transformation for z component

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In Vulkan, for 'z' (depth) component, the scale and translate values
for the viewport transformation are:

pz = maxDepth - minDepth
oz = minDepth

zf = pz × zd + oz

Being zd, the third component in vertex's normalized device coordinates.

Fixes: dEQP-VK.draw.inverted_depth_ranges.*

Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Cc: mesa-stable@lists.freedesktop.org
This commit is contained in:
Samuel Iglesias Gonsálvez
2017-09-15 10:05:03 +02:00
parent 3e54493265
commit d2cd9deeb8
1 changed files with 2 additions and 2 deletions
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src/intel/vulkan/gen8_cmd_buffer.c
+2 -2
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@@ -49,10 +49,10 @@ gen8_cmd_buffer_emit_viewport(struct anv_cmd_buffer *cmd_buffer)
struct GENX(SF_CLIP_VIEWPORT) sf_clip_viewport = {
.ViewportMatrixElementm00 = vp->width / 2,
.ViewportMatrixElementm11 = vp->height / 2,
.ViewportMatrixElementm22 = 1.0,
.ViewportMatrixElementm22 = vp->maxDepth - vp->minDepth,
.ViewportMatrixElementm30 = vp->x + vp->width / 2,
.ViewportMatrixElementm31 = vp->y + vp->height / 2,
.ViewportMatrixElementm32 = 0.0,
.ViewportMatrixElementm32 = vp->minDepth,
.XMinClipGuardband = -1.0f,
.XMaxClipGuardband = 1.0f,
.YMinClipGuardband = -1.0f,